NAME

       MPI_Comm_f2c,   MPI_Comm_c2f,   MPI_File_f2c,  MPI_File_c2f,  MPI_Info_f2c,  MPI_Info_c2f,
       MPI_Op_f2c,  MPI_Op_c2f,  MPI_Request_f2c,  MPI_Request_c2f,  MPI_Type_f2c,  MPI_Type_c2f,
       MPI_Win_f2c, MPI_Win_c2f  - Translates a C handle into a Fortran handle, or vice versa.

SYNTAX

C Syntax

       #include <mpi.h>
       MPI_Comm MPI_Comm_f2c(MPI_Fint comm)
       MPI_Fint MPI_Comm_c2f(MPI_Comm comm)

       MPI_File MPI_File_f2c(MPI_Fint file)
       MPI_Fint MPI_File_c2f(MPI_File file)

       MPI_Group MPI_Group_f2c(MPI Fint group)
       MPI_Fint MPI_Group_c2f(MPI Group group)

       MPI_Info MPI_Info_f2c(MPI_Fint info)
       MPI_Fint MPI_Info_c2f(MPI_Info info)

       MPI_Op MPI_Op_f2c(MPI_Fint op)
       MPI_Fint MPI_Op_c2f(MPI_Op op)

       MPI_Request MPI_Request_f2c(MPI_Fint request)
       MPI_Fint MPI_Request_c2f(MPI_Request request)

       MPI_Datatype MPI_Type_f2c(MPI_Fint datatype)
       MPI_Fint MPI_Type_c2f(MPI_Datatype datatype)

       MPI_Win MPI_Win_f2c(MPI_Fint win)
       MPI_Fint MPI_Win_c2f(MPI_Win win)

DESCRIPTION

       Handles  are passed between Fortran and C or C++ by using an explicit C wrapper to convert
       Fortran handles to C handles. There is no direct access to C or C++  handles  in  Fortran.
       Handles  are passed between C and C++ using overloaded C++ operators called from C++ code.
       There is no direct access to C++ objects from C. The type definition MPI_Fint is  provided
       in C/C++ for an integer of the size that matches a Fortran INTEGER; usually, MPI_Fint will
       be equivalent to int. The handle translation functions are provided in C to convert from a
       Fortran handle (which is an integer) to a C handle, and vice versa.

       For  example,  if  comm  is  a  valid  Fortran handle to a communicator, then MPI_Comm_f2c
       returns a valid C handle to that same  communicator;  if  comm  =  MPI_COMM_NULL  (Fortran
       value),  then  MPI_Comm_f2c returns a null C handle; if comm is an invalid Fortran handle,
       then MPI_Comm_f2c returns an invalid C handle.

NOTE

       This function does not return an error value.  Consequently,  the  result  of  calling  it
       before MPI_Init or after MPI_Finalize is undefined.